.history-hub-hero{padding:72px 0 24px;position:relative;isolation:isolate}.history-hub-hero h1{font-size:clamp(42px,6vw,76px)}.era-ribbon{display:flex;gap:20px;align-items:center;flex-wrap:wrap;margin-top:48px;padding:22px 0;border-block:1px solid var(--line);color:var(--muted);font-size:11px;letter-spacing:1px}.era-ribbon i{color:var(--gold)}.hub-search{display:grid;gap:10px;font-size:13px}.hub-search input,#assistant-input{width:100%;padding:16px;border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--ink);font:inherit}.unit{border:1px solid var(--line);border-radius:16px;margin:16px 0;background:var(--surface);overflow:hidden;transition:border-color .3s,box-shadow .3s}.unit:hover{border-color:var(--gold)}.unit>summary{display:flex;gap:20px;align-items:center;cursor:pointer;list-style:none;padding:24px}.unit summary::-webkit-details-marker{display:none}.unit-no{font-size:26px;color:var(--gold);font-family:Georgia}.unit summary strong{display:block;font-size:18px}.unit summary small{display:block;color:var(--muted);margin-top:8px;font-size:12px}.unit summary:after{content:'+';margin-left:auto;font-size:24px;color:var(--gold)}.unit[open] summary:after{content:'−'}.unit-body{padding:0 24px 24px;animation:card-enter .4s ease}.subtopics{display:flex;gap:8px;flex-wrap:wrap;padding:10px 0 20px}.subtopics span{font-size:11px;padding:8px 12px;border:1px solid var(--line);border-radius:20px;color:var(--muted)}.lesson-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.lesson{border:1px solid var(--line);border-radius:12px;padding:22px;display:flex;flex-direction:column;background:var(--bg)}.lesson h3{font-size:22px;margin:10px 0}.lesson p{font-size:14px;line-height:1.8}.lesson .mnemonic{background:var(--soft);padding:12px;border-radius:8px;color:var(--gold);font-weight:700;font-size:12px}.lesson .learn-hub{margin-top:auto}.learn-hub[aria-pressed=true]{background:var(--soft);border-color:var(--gold)}.unit-links{display:flex;gap:16px;flex-wrap:wrap;margin-top:18px;font-size:13px}.test-choices,.assistant-suggestions{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0}.test-choices button,.assistant-suggestions button{border:1px solid var(--line);padding:12px;border-radius:24px;background:var(--surface);color:var(--ink);cursor:pointer;font:inherit;font-size:13px}.test-choices button:hover,.assistant-suggestions button:hover{border-color:var(--gold);transform:translateY(-2px)}.test-toolbar{display:flex;gap:18px;align-items:end;flex-wrap:wrap}.test-toolbar label{display:grid;gap:8px;font-size:12px}.hub-quiz{margin:24px 0;background:var(--surface);padding:30px;border:1px solid var(--line);border-radius:18px;min-height:210px}.hub-quiz h3{font-size:26px;line-height:1.4}.hub-options{display:grid;gap:10px}.hub-options button{padding:16px;text-align:left;border:1px solid var(--line);background:var(--bg);color:var(--ink);border-radius:10px;cursor:pointer;font:inherit}.hub-options .correct{background:#d9eadc;color:#183d26;border-color:#3d8051}.hub-options .wrong{background:#f3d8d5;color:#612d24;border-color:#a75a4c}.hub-options button:disabled{cursor:default}.quiz-explanation{line-height:1.8;padding:18px 0}.quiz-progress{height:5px;background:var(--soft);border-radius:5px;overflow:hidden}.quiz-progress span{display:block;background:var(--gold);height:100%;transition:width .4s}.existing-tests,.source-cards{display:flex;gap:18px;flex-wrap:wrap}.existing-tests a{font-size:13px}.source-cards a{flex:1;min-width:220px;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:24px;text-decoration:none;transition:transform .3s}.source-cards a:hover{transform:translateY(-5px)}.source-cards span{display:block;font-size:12px;margin-top:12px;color:var(--muted)}#assistant-form>div{display:flex;gap:12px;margin-top:12px;align-items:center}#assistant-form .primary{white-space:nowrap;margin:0}#assistant-response{padding:24px 0;line-height:1.8}.assistant-match{border:1px solid var(--line);background:var(--surface);border-radius:12px;padding:20px;margin:12px 0}.assistant-match h3{font-size:23px;margin:8px 0}.assistant-match a{font-size:13px}.assistant-match .mnemonic{color:var(--gold);font-weight:700;font-size:12px}.score-big{font-size:56px;color:var(--gold);margin:15px 0}.history-hub-hero:before{content:'';position:absolute;inset:0 0 0 45%;z-index:-1;background:radial-gradient(ellipse,#b8944530,transparent 65%);animation:ambient-glow 9s ease-in-out infinite}.history-hub-hero h1{animation:title-enter .9s ease both}.unit{animation:card-enter .5s ease both}@media(max-width:650px){.lesson-grid{grid-template-columns:1fr}.unit>summary{padding:20px 16px;gap:12px}.unit summary strong{font-size:16px}.unit-body{padding:0 16px 20px}.hub-quiz{padding:22px 16px}.test-toolbar{align-items:stretch}.test-toolbar label{flex:1;min-width:140px}#assistant-form>div{flex-wrap:wrap}.history-hub-hero{padding-top:38px}}